package day07;

import java.util.Random;

/**
 *需求：生成6位验证码(大写字母、小写字母、数字)
 *
 */
public class VerificationCode {
    public static String generateVeriCode(int len){
        String code= " ";
        char[] chs={'a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p'
                ,'q','r','s','t','u','v','w','x','y','z','A','B','C','D','E','F',
                'G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U',
                'V','W','X','Y','Z','0','1','2','3','4','5','6','7',
                '8','9','0'};
        for(int i=1;i<=len;i++){
            int idex=(int)(Math.random()*chs.length); //写几不包括几
            code+=chs[idex];
        }
        return code;
        }


    public static void main(String[] args) {
        String code=generateVeriCode(6);
        System.out.println("验证码"+code);
      /*  Random random=new Random(); //与scanner相同
        int index=random.nextInt(100); //括号里写范围，不包括100,0-99


       */
    }

}
